. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 294 Geology and geophysics 170 180 170 -? 7 7 7 7 7 7 7 7 1 7â7 1 ? 1 } 1 1âI 1 TT iâ( 1 T â ^WRANGEL ISLAND CHUKCHI SEA. NUNIVAK ISLAND ^^--^ fill VJ 74 160 Figure 18-1. Geographic features of northwestern Alaska and northeastern Siberia. The geology of Seward Peninsula is strikingly simi- lar to that of the Chukotsk Peninsula. Paleozoic and some Precambrian sedimentary and metamorphic rocks underlie most of the peninsula, with extensive occurrences of Tertiary
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 294 Geology and geophysics 170 180 170 -? 7 7 7 7 7 7 7 7 1 7â7 1 ? 1 } 1 1âI 1 TT iâ( 1 T â ^WRANGEL ISLAND CHUKCHI SEA. NUNIVAK ISLAND ^^--^ fill VJ 74 160 Figure 18-1. Geographic features of northwestern Alaska and northeastern Siberia. The geology of Seward Peninsula is strikingly simi- lar to that of the Chukotsk Peninsula. Paleozoic and some Precambrian sedimentary and metamorphic rocks underlie most of the peninsula, with extensive occurrences of Tertiary extrusives near Cape Espen- berg and in the eastern part of the peninsula. The rocks of Seward Peninsula are cut by numerous zones of thrust faults, along which the movement has been eastward (Sainsbury 1969). From Cape Krusenstem northwest to Cape Lis- burne, the coastline consists for the most part of cliffs formed by rocks of the Brooks Range, the De Long Mountains, and the Lisburne Hills. The Brooks Range is formed by a belt of predominantly Paleozoic rocks, and Early Cretaceous orogenic rocks have been thrust northward, forming tectonic sheets of Jurassic mafic and ultramafic rocks and Devonian and Missis- sippian carbonate rocks unlike the Devonian schists and Mississippian rocks which they override. North of this trend is a narrow zone of chaotically deformed lower Mesozoic and upper Paleozoic rocks that has been called the Disturbed Belt (Tailleur and Brosge 1970, Brosg6 and Tailleur 1970). The southern margin of the Brooks Range (Fig. 18- 2) is formed by the Kobuk Trench (Grantz 1966). South of this feature, the rocks of the Yukon-Koyu- kuk basin consist of strongly deformed Permian to Jurassic volcanic and Cretaceous sedimentary and vol- canic rocks (Payne 1955, Patton 1973). The southern part of the Yukon-Koyukuk basin is cut by the Kal- tag fault (Fig. 18-2), a major northeast-trending trans- current fault showing right-lateral displacement (Pat- ton and Hoare 1
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